Table 1 Summary characteristics of 97 included systematic reviews
Characteristic | N of SRs |
|---|---|
Year | |
 1995–2000 | 4 |
 2001–2005 | 10 |
 2005–2010 | 27 |
 2011–2015 | 56 |
Number of authors | |
 1 | 1 |
 2–5 | 72 |
 6–10 | 23 |
 > 10 | 1 |
Language of the studies included in SRs | |
 Any language | 49 |
 English | 30 |
 English plus other | 18 |
 Not reported | 6 |
Language of SRs | |
 English | 91 |
 Chinese | 2 |
 French | 1 |
 German | 1 |
 Spanish | 1 |
 Portuguese and English | 1 |
Number of RCTs included | |
 0–1 | 8 |
 2–10 | 37 |
 11–20 | 30 |
 21–30 | 14 |
 31–40 | 4 |
 41–100 | 3 |
 > 100 | 1 |
Number of databases searched | |
 1 | 1 |
 2–3 | 27 |
 4–5 | 38 |
 > 6 | 31 |
Neuropathic pain type | Â |
 Peripheral | 86 |
 Central | 2 |
 Peripheral and central | 9 |
Total number of patients | |
 0 | 7 |
 1–1000 | 28 |
 1001–2000 | 28 |
 2001–4000 | 14 |
 > 4001 | 12 |
 Unclear | 8 |
Meta-analysis | |
 Yes | 65 |
 No | 25 |
 Not applicable (empty review) | 7 |
Update of previous SR | Â |
 Yes | 10 |
 No | 87 |
Number of updates | |
 1 | 7 |
 2–3 | 2 |
 > 4 | 1 |
Funding source | |
 Not reported | 35 |
 No external funding | 13 |
 Government | 12 |
 Foundation | 12 |
 None | 11 |
 Industry | 8 |
 Multiple | 6 |